Adapter connector for cell phones and tablets
One of these ($4 for 5) came bundled with a USB Flash drive I purchased. Insert one end into the male USB plug of the Flash drive, and the other end is micro USB compatible, so it can plug into your phone or other devices. For years, I just used it to transfer files to and from flash drives into my phone, but then I learned a really neat thing: It will also work with the transmitter dongle for my wireless keyboard and mouse! On those occasions when I wish to use my tablet (a Kindle Fire 7) more like a computer, I can connect my full-size keyboard and mouse to the tablet with this adapter. The peripherals work just as expected, letting me type at normal speeds, and have the precise cursor control that I expect from a mouse. It has been really convenient. I have this wireless mini-keyboard/trackpad device which also can use in this way. So when I don’t want to carry a notebook computer, but still need to do some typing, this adapter is just the thing. The one I am linking to is very small and inexpensive. It is thin enough that I can store it, in a paper envelope, inside my wallet without trouble.
-- Daniel Kim
01/15/19
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Ultra Mini DM Micro USB 5pin OTG Adapter Connector for Cell Phone Tablet & USB Cable & Flash Disk - 5pcs ($4)

the report says the 2019 iPhone might make the jump to USB-C, just like the 2018 iPad Pros

Macotakara says that “those who are working on” the iPhone’s USB-C transition indicate it has not yet reached the reference design stage. This could suggest that the transition will miss the 2019 iPhone refresh.